Taxonomy & naming
Schistura novemradiata was described by the Swiss ichthyologist Maurice Kottelat in 2000. Searches of the available literature turn up no earlier combination for this species — unlike many of its relatives, which spent decades filed under the old catch-all genera Nemacheilus or Noemacheilus before being redistributed to Schistura, Triplophysa, Barbatula and others, novemradiata appears to have been placed in Schistura from the start.
It belongs to the family Nemacheilidae, the stone or brook loaches, by far the largest family in the loach superfamily Cobitoidea and one that has been repeatedly reshuffled at generic level. The Catalog of Fishes is the standing authority for the valid name and combination; as held there, the species remains Schistura novemradiata.
Morphology
Schistura novemradiata is a small loach, reported at up to about 2 in standard length — modest even by the standards of this genus of compact stream fish. Beyond that figure, no detailed description of its colour pattern or fin-ray counts has turned up in the sources consulted for this article, and it would be irresponsible to invent one.
As a member of Schistura it can reasonably be expected to share the broad hallmarks of the genus: an elongate, low-slung body suited to holding position on the bottom in current, a ventrally flattened head, and — as in other nemacheilids — a small, erectile spine below the eye and fine, deeply embedded scales that leave the skin close to naked. Those traits matter directly for handling and medicating the fish, but for this species specifically they are inferred from its genus rather than confirmed by a dedicated account.
Habitat
The species is known from a single locality: the upper watershed of the Nam Tha, a river system in northern Laos, where it was collected in small creeks running over gravel and stone substrate. No other populations or localities have been reported, which is common among Schistura — many species in the genus are narrow-range stream endemics known from just one or a few sites.
This is a tropical, freshwater, benthopelagic species living close to the streambed rather than in open water. Small hill and forest creeks of this kind are typically cool-to-warm, clear, fast-flowing and well-oxygenated, and that is the water Schistura novemradiata should be assumed to need — not the warm, slow, tannin-stained water associated with many other tropical aquarium fish.
Feeding
No feeding study exists for this species specifically, but its family gives a reliable picture. Nemacheilid stone loaches are micro-predators that work the streambed for small invertebrates — insect larvae, small crustaceans and other tiny prey — picked out of gravel and stone in fast-flowing water.
An aquarium diet for a fish of this profile would lean on small sinking live and frozen foods such as bloodworm, brine shrimp and daphnia, supplemented with quality sinking pellets; like many bottom-feeding stream loaches it would likely take little interest in flake left to float.
Mating
Nothing specific has been published on courtship or spawning behaviour in Schistura novemradiata. No external sexual dimorphism has been documented for the species, and given how little fieldwork exists beyond its original description, that absence should be read as a gap in knowledge rather than evidence that none exists.
For context, stone loaches in this family are not known for elaborate courtship; where breeding behaviour has been observed in related Schistura and other nemacheilids, it typically involves simple pairing over gravel in fast-flowing water rather than any pair-bonding or display behaviour comparable to cichlids or gouramis.
Breeding
As with feeding, no captive or field breeding account exists for this exact species, so the honest description follows the general pattern for stone and brook loaches (Nemacheilidae): egg-scattering over gravel and among stones in fast-flowing water, with no parental care afterward. Eggs and larvae are left to develop unguarded on the streambed.
Schistura novemradiata is not known to have been bred in the aquarium, and given how rarely even well-established Schistura species are spawned at home, that would not be surprising. Anyone keeping this species should not expect to breed it; the honest expectation is observation and maintenance, not reproduction.
In the aquarium
Schistura novemradiata is essentially unknown in the hobby, and no dedicated care account was found for it. Any aquarium approach has to be extrapolated cautiously from its genus and family: a small (under 2.5 in), bottom-dwelling stream loach that needs cool-to-moderate, clear, fast-moving, well-oxygenated water over a gravel or stone substrate rather than a warm, static tank — closer to a hillstream setup than a typical tropical community.
Like other nemacheilids it can be assumed to have fine, near-scaleless skin, which in this family generally means sensitivity to copper and to full-strength medications; a cautious, half-dose approach to treatment is the safer default until species-specific data exists. Given the total absence of trade or husbandry records, this is a fish for researchers or specialist collectors working from wild-collected material rather than a species to expect from a shop.
Conservation
Schistura novemradiata is listed by the IUCN Red List as Data Deficient, an assessment last recorded in 2011. That status fits a species known from a single locality in the upper Nam Tha watershed of Laos, where the scale of its range, its population trend and the pressures it faces have not been adequately studied.
As a narrow-range stream endemic, it would be vulnerable in principle to the pressures common across mainland Southeast Asian headwaters — deforestation, sedimentation, damming and other alteration of small streams — but no study has documented an actual decline for this species. There is no evidence it enters the aquarium trade in any volume; it should be treated as a data-sparse fish requiring more field study rather than one with a known, described threat status beyond Data Deficient.